/*
 *
 * (c) Copyright Ascensio System Limited 2010-2018
 *
 * This program is freeware. You can redistribute it and/or modify it under the terms of the GNU 
 * General Public License (GPL) version 3 as published by the Free Software Foundation (https://www.gnu.org/copyleft/gpl.html). 
 * In accordance with Section 7(a) of the GNU GPL its Section 15 shall be amended to the effect that 
 * Ascensio System SIA expressly excludes the warranty of non-infringement of any third-party rights.
 *
 * THIS PROGRAM IS DISTRIBUTED WITHOUT ANY WARRANTY; WITHOUT EVEN THE IMPLIED WARRANTY OF MERCHANTABILITY OR
 * FITNESS FOR A PARTICULAR PURPOSE. For more details, see GNU GPL at https://www.gnu.org/copyleft/gpl.html
 *
 * You can contact Ascensio System SIA by email at sales@onlyoffice.com
 *
 * The interactive user interfaces in modified source and object code versions of ONLYOFFICE must display 
 * Appropriate Legal Notices, as required under Section 5 of the GNU GPL version 3.
 *
 * Pursuant to Section 7 § 3(b) of the GNU GPL you must retain the original ONLYOFFICE logo which contains 
 * relevant author attributions when distributing the software. If the display of the logo in its graphic 
 * form is not reasonably feasible for technical reasons, you must include the words "Powered by ONLYOFFICE" 
 * in every copy of the program you distribute. 
 * Pursuant to Section 7 § 3(e) we decline to grant you any rights under trademark law for use of our trademarks.
 *
*/


using System;
using System.Collections.Generic;

using ASC.Common;
using ASC.Common.Caching;

namespace ASC.IPSecurity
{
    public class IPRestrictionsServiceCache
    {
        private const string cacheKey = "iprestrictions";
        public ICache Cache { get; set; }

        public ICacheNotify<IPRestrictionItem> Notify { get; }

        public IPRestrictionsServiceCache(ICacheNotify<IPRestrictionItem> notify)
        {
            Cache = AscCache.Memory;
            notify.Subscribe((r) => Cache.Remove(GetCacheKey(r.TenantId)), CacheNotifyAction.Any);
            Notify = notify;
        }

        public static string GetCacheKey(int tenant)
        {
            return cacheKey + tenant;
        }
    }
    public class IPRestrictionsService
    {
        private readonly ICache cache;
        private readonly ICacheNotify<IPRestrictionItem> notify;
        private static readonly TimeSpan timeout = TimeSpan.FromMinutes(5);

        public IPRestrictionsRepository IPRestrictionsRepository { get; }

        public IPRestrictionsService(
            IPRestrictionsRepository iPRestrictionsRepository,
            IPRestrictionsServiceCache iPRestrictionsServiceCache)
        {
            IPRestrictionsRepository = iPRestrictionsRepository;
            cache = iPRestrictionsServiceCache.Cache;
            notify = iPRestrictionsServiceCache.Notify;
        }

        public IEnumerable<IPRestriction> Get(int tenant)
        {
            var key = IPRestrictionsServiceCache.GetCacheKey(tenant);
            var restrictions = cache.Get<List<IPRestriction>>(key);
            if (restrictions == null)
            {
                cache.Insert(key, restrictions = IPRestrictionsRepository.Get(tenant), timeout);
            }
            return restrictions;
        }

        public IEnumerable<string> Save(IEnumerable<string> ips, int tenant)
        {
            var restrictions = IPRestrictionsRepository.Save(ips, tenant);
            notify.Publish(new IPRestrictionItem { TenantId = tenant }, CacheNotifyAction.InsertOrUpdate);
            return restrictions;
        }
    }

    public static class IPRestrictionsServiceExtension
    {
        public static DIHelper AddIPRestrictionsService(this DIHelper services)
        {
            services.TryAddScoped<IPRestrictionsService>();
            services.TryAddSingleton<IPRestrictionsServiceCache>();

            return services.AddIPRestrictionsRepositoryService();
        }
    }
}